package org.hrhr74.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWork {
    /*
    开始的时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1640095200L;
    private static final int COUNT_BIT = 32;

    public RedisIdWork(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    private StringRedisTemplate stringRedisTemplate;


    public long nextId(String prefixKey){
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //生成序列号
            //获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //自增长
        Long id = stringRedisTemplate.opsForValue().increment("icr:" + prefixKey + ":" + date);
        //拼接并返回
        return timeStamp << COUNT_BIT | id;
    }


}
